Improvement in hot-air furnaces



2 Sheets--Sheet 2.

Patented Nov M A. BUYNTUN. Haft-Air Furnace-s. No'.l56,759'.

UNITED STATES PATENT OFFICE.

ANAIHANIEL A. BOYNTON, OF NEW YORK, N. Y.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 156,759, dated November10, 1874 application led July 11, 1374.

To all whom it may concern:

Be it known that I,- NATHANIEL A. BoYN- TON, of New York city, in thecounty of New York and in the State of New York, have invented certainnew and useful Improvements in Furnaces; and do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, making a part of thisspecification, in which- Figure l is a side elevation of my improvedfurnace, with the exterior portions and casing removed. of the same,upon a line passing from front to rear. Fig. 3 is avertical section ofthe central portion of the frontside of the radiator, upon line x wot'Fig. 2. Figs. 4 and 5 are perspective views of the inner or engagingfaces of the collars employed for connecting the body and radiator. Fig.6 is a horizontalsec- Jfion of said collars, as combined, and ot' thecontiguous portions of the body and radiator; and Fig. 7 is a verticalsection of said parts, upon a line extending through the centers of thelocking lugs or ears upon one side.

Letters of like name and kind refer to like parts in each of thefigures.

The design of my invention is to increase the efciency and perfectnessof operation of a hot-air furnace; and it consists, principally, in themeans employed for locking together the collars which form theconnection between the body and radiator, substantially1 as and for thepurpose hereinafter specified. It consists, further, in the flue-stripsarranged within the radiator at each side of the exit-flue, for thepurpose of keeping the heated gases at a low point within the radiator,substantially as is hereinafter shown. l

In the annexed drawings, A represents the body of my heater,constructed, preferably, in the form of a straight cylinder, the upperend of which is permanently inclosed by means of a head, a, while itslower end (which forms the fuel-chamber) is provided with a frame, B,for the support of a grate. At its front side, at a suitable point abovethe grate, the body A is provided with a feed-chute, C, of usualconstruction, while at its rear side, and near its upper end, is secureda collar, D, which surrounds an opening, c', provided for Fig. 2 is avertical central section the outward passage of the heated escapingproducts of combustion. Around the upper portion of the body A is placeda radiator, E, which has an annular form horizontally, is constructedwith double walls in the usual manner, and has such horizonal dimensionsas to cause the space between its inner wall and the exterior of saidbody to substantially equal, in radial dimensions, the flue or space Fwithin said radiator. Upon the inner side of the radiator E is secured acollar, G, which corresponds in size and shape to the like features ofthe collar D, and is provided, within its face, with a groove, g, thatcorresponds to and receives the iiange d, which projects from saidcollar D. Upon each side of the collar G, at its vertical center, isprovided a lug or ear, g', which lug, when said collar is combinedwith.the collar D, passes between two similar lugs, d and d', that aresecured to and extend outward from the latter, and each of said lugsbeing provided with a suitable vertical opening, a rod, H, is passedthrough the same and locks said parts securely in position.

In order that the collars D and G may be pressed firmly together, so asto form a close `joint between their lengaging surfaces, the openings inthe lugs d and g are formed, respectively, slightly inside and outsideof their common centers, so that the rod H (which is made tapering atits lower end) may be caused to bear against the outer sides of theopenings in said lugs d', and the inner sides of the lugs g', as shownin Fig. 7, so that, when driven downward, said rod will draw said lugsand their collars together. While a slight downward movement of the rodswill draw the collars as firmly together as may be necessary, said rodsare easily loosened and withdrawn whenever it becomes necessary todisconnect the body and radiator.

The direct-draft exitpipe I is located directly in rear of the collar Gof the radiator E but, for the purpose of rendering available theradiatingsurface of the latter, a second exit-pipe, K, is provided atthe front side ot' vthe same, and a damper, i, placed within said v pipeI, so as to compel the heated escaping gasesv to pass through saidradiator and out of said pipe K. The pipe K is placed near the upper endof the radiator E, and upon each side ofthe same, Within the ilue F, isplaced a flue-strip, f, which closes said flue from its upper sidedownward below its vertical center. This arrangement of the lluestripscauses the heated gases to pass downward to the lower side of theradiator before escaping into and through the exit-line, and therebylargely increases the effective heating capacity of said radiator.

` It will be seen that, as combined, a clear space, L, is left betweenthe radiator and body at all points, except Where the collars aresituated7 and that, if the air is permitted to circulate freely throughsuch space, a large percentage of the heat radiated from said parts willbe made available, the heating capacity of the furnace being thuslargely increased.

Having thus fully set forth the nature and merits of myjnvention, what Iclaim as new is- 1. In a heating-furnace having a central body, A, andsurrounding radiator E, the collars D and G, provided, respectively,with the perforated lugs d d and g g', and the tapering rods H and H,passing through said lugs, said parts bein gcombined to form anair-tight connection between said body and radiator7 substantially asspecified.

2. The flue-strips fand f, located within the ue F of the radiator E,upon opposite sides of the exit-pipe K, in :combination with said parts,substantially as and for the purpose shown.

In testimony that I claim the foregoing I have hereunto set my hand this8th day of May, 1874.

NATHANIEL A. BOYNTON. Witnesses:

WoR'rHINGToN GREGORY, JAMES B. TAYLOR.

